<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .container {
            display: flex;
            flex-direction: row;
            justify-content: space-between;
        }
        .child {
            width: 100px;
            height: 100px;
            background-color: pink;
            display: flex;
            justify-content: center;
            align-items: center;
        }
    </style>
</head>
<body>
   <div class="container">
    <div class="child">
        <span>测试</span>
    </div>
    <div class="child">
        <span>测试</span>
    </div>
    <div class="child">
        <span>测试</span>
    </div>

   </div>
</body>
</html>